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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dc11e5ca2a24b697c8507b83ec820e311c63976491151ddee71e5334764a3b0' 
  AND token = 'q2c1pihuAGe5ldaxeZ73ENJlk93m07wZKIayt2ltR/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}